import { readFileSync } from "fs"; const t0 = performance.now(); const categories = readFileSync("input.txt") .toString() .split("\n\n") .filter((e) => e.length > 0); const seeds = categories[0] .split(" ") .slice(1) .map((e) => parseInt(e)); const dictionaries = categories.slice(1).map((e) => { const splits = e.split(/\r*\n/).filter((e) => e.length > 0); const name = splits[0].replace(" map:", ""); const maps = splits.slice(1).map((a) => a .split(" ") .filter((b) => b.length > 0) .map((c) => parseInt(c)) ); const filter = (j) => maps.reduce((a, i) => [...a, i[j]], []); return { name, ranges: { destination: filter(0), source: filter(1), length: filter(2), }, }; }); const locations = seeds.map((e) => dictionaries.reduce((a, i, j) => { const current = j === 0 ? e : a; return ( i.ranges.source.reduce((b, p, k) => { const next = current - p; const inRange = next >= 0 && next <= i.ranges.length[k]; return inRange ? i.ranges.destination[k] + next : b; }, null) ?? current ); }, 0) ); const closest = locations.reduce((a, i) => Math.min(a, i)); console.log(closest); const t1 = performance.now(); console.log(`Runtime: ${t1 - t0}ms`);